# 螺旋等边三角形
import turtle as t
t.speed(0)
t.penup()
t.goto(0,-50)
t.pendown()
for i in range(100,1,-10):
    # t.circle(i)
    if i % 20 == 0:
        t.fillcolor("blue")
    else:
        t.fillcolor("white")
    t.begin_fill()
    t.circle(i,360)
    t.end_fill()
t.hideturtle()
t.done()